Family XIII. MOTACILLINAE. WAGTAILS.
GENUS I. SEIURUS, Swains. WOOD-WAGTAILS
Bill rather short, straight, slightly broader than deep at the base, compressed toward the end, the edges a little inflected, the dorsal lines of both mandibles slightly convex, the notches very slight, the tip acute. Nostrils basal elliptical. General form slender; head ovato-oblong. Feet of ordinary length; tarsus slender, compressed, covered anteriorly with a long undivided piece and three inferior scutella; toes of moderate length, slender; the first a little stouter than the third, the inner slightly shorter than the outer, which is adherent at the base; claws of moderate length, very slender, much compressed, moderately arched, acute. Plumage soft, blended. Bristles very small. Wings of moderate length; the first or outer quill little shorter than the third, which is longest. Tail of moderate length, even.